多线程 全局变量 部分函数加锁问题

具体见：

http://blog.csdn.net/theplayerwuliang/article/details/6431722

复制代码可运行：

#pragma once 
#include "stdafx.h"
#include < windows.h > 
//class InstanceLock; 
class InstanceLockBase 
     { 
        friend class InstanceLock; 
        CRITICAL_SECTION cs; 
        void Lock() 
            { 
                ::EnterCriticalSection( & cs); 
        } 
        void Unlock() 
             { 
                ::LeaveCriticalSection( & cs); 
        } 
protected : 
    InstanceLockBase() 
     { 
            ::InitializeCriticalSection( & cs); 
    } 
    ~ InstanceLockBase() 
         { 
            ::DeleteCriticalSection( & cs); 
    } 
} ; 
class InstanceLock 
     { 
        InstanceLockBase * _pObj; 
public : 
    InstanceLock(InstanceLockBase * pObj) 
     { 
            _pObj = pObj; 
            if (NULL != _pObj) 
                _pObj -> Lock(); 
    } 
    ~ InstanceLock() 
        { 
            if (NULL != _pObj) 
                _pObj -> Unlock(); 
    } 
} ;

void Say( char * text) 
     { 
        static int count = 0 ; 
        SYSTEMTIME st; 
        ::GetLocalTime( & st); 
        printf( " %03d [%02d:%02d:%02d.%03d]%s " , ++ count, st.wHour, st.wMinute, st.wSecond, st.wMilliseconds, text); 
}

class MyClass: public InstanceLockBase 
    {} ; 
MyClass mc;

DWORD CALLBACK ThreadProc(LPVOID param) 
     { 
        InstanceLock il( & mc); 
        Say( " in sub thread, lock
 " ); 
        Sleep( 2000 ); 
        Say( " in sub thread, unlock
 " ); 
        return 0 ; 
}



int main()
{
    while(1)
{    CreateThread( 0 , 0 , ThreadProc, 0 , 0 , 0 ); 
    InstanceLock il( & mc); 
    Say( " in main thread, lock 
" ); 
    Sleep( 3000 ); 
    Say( " in main thread, unlock 
" );
    }
    
    return 0;
}